sdot.f.html

来自「famous linear algebra library (LAPACK) p」· HTML 代码 · 共 87 行

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<pre>
      REAL FUNCTION <a name="SDOT.1"></a><a href="sdot.f.html#SDOT.1">SDOT</a>(N,SX,INCX,SY,INCY)
<span class="comment">*</span><span class="comment">     .. Scalar Arguments ..
</span>      INTEGER INCX,INCY,N
<span class="comment">*</span><span class="comment">     ..
</span><span class="comment">*</span><span class="comment">     .. Array Arguments ..
</span>      REAL SX(*),SY(*)
<span class="comment">*</span><span class="comment">     ..
</span><span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">  Purpose
</span><span class="comment">*</span><span class="comment">  =======
</span><span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">     forms the dot product of two vectors.
</span><span class="comment">*</span><span class="comment">     uses unrolled loops for increments equal to one.
</span><span class="comment">*</span><span class="comment">     jack dongarra, linpack, 3/11/78.
</span><span class="comment">*</span><span class="comment">     modified 12/3/93, array(1) declarations changed to array(*)
</span><span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">
</span>
<span class="comment">*</span><span class="comment">     .. Local Scalars ..
</span>      REAL STEMP
      INTEGER I,IX,IY,M,MP1
<span class="comment">*</span><span class="comment">     ..
</span><span class="comment">*</span><span class="comment">     .. Intrinsic Functions ..
</span>      INTRINSIC MOD
<span class="comment">*</span><span class="comment">     ..
</span>      STEMP = 0.0e0
      <a name="SDOT.27"></a><a href="sdot.f.html#SDOT.1">SDOT</a> = 0.0e0
      IF (N.LE.0) RETURN
      IF (INCX.EQ.1 .AND. INCY.EQ.1) GO TO 20
<span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">        code for unequal increments or equal increments
</span><span class="comment">*</span><span class="comment">          not equal to 1
</span><span class="comment">*</span><span class="comment">
</span>      IX = 1
      IY = 1
      IF (INCX.LT.0) IX = (-N+1)*INCX + 1
      IF (INCY.LT.0) IY = (-N+1)*INCY + 1
      DO 10 I = 1,N
          STEMP = STEMP + SX(IX)*SY(IY)
          IX = IX + INCX
          IY = IY + INCY
   10 CONTINUE
      <a name="SDOT.43"></a><a href="sdot.f.html#SDOT.1">SDOT</a> = STEMP
      RETURN
<span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">        code for both increments equal to 1
</span><span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">        clean-up loop
</span><span class="comment">*</span><span class="comment">
</span>   20 M = MOD(N,5)
      IF (M.EQ.0) GO TO 40
      DO 30 I = 1,M
          STEMP = STEMP + SX(I)*SY(I)
   30 CONTINUE
      IF (N.LT.5) GO TO 60
   40 MP1 = M + 1
      DO 50 I = MP1,N,5
          STEMP = STEMP + SX(I)*SY(I) + SX(I+1)*SY(I+1) +
     +            SX(I+2)*SY(I+2) + SX(I+3)*SY(I+3) + SX(I+4)*SY(I+4)
   50 CONTINUE
   60 <a name="SDOT.62"></a><a href="sdot.f.html#SDOT.1">SDOT</a> = STEMP
      RETURN
      END

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